DEVELOPMENT OF FILAMENT-REINFORCED METALS.
Abstract
An investigation was conducted to develop filament-reinforced metals for use at elevated temperatures. The use of carbon filaments to reinforce nickel, cobalt, aluminum and platinum, and the use of silicon carbide filaments to reinforce aluminum and nickel were considered. Uniform microstructures were obtained by fabricating composites from metal-coated filaments where the coating becomes the matrix of the composite. Of the coating techniques investigated, electroless deposition was found to be the most suitable for obtaining uniform coatings on the individual filaments of Thornel yarn. Although the phosphorus content of nickel obtained from conventional electroless-nickel plating baths made this material useless as a matrix, conventional electroless-cobalt produced an attractive matrix material. Phosphorus-free nickel and platinum coatings of relatively high purity were obtained by electroless deposition using hydrazine as a reducing agent. These materials are attractive matrices. Cobalt-Thornel composites were fabricated by swaging and hot isostatically compacting cobalt-coated Thornel filaments. The microstructural stability of these composites at 1800 F was excellent, but their oxidation behavior was erratic. The maximum tensile strength attained in room temperature measurements was approximately 50 percent of the theoretical strength, as calculated using a continuous-filament model, and was attained for a filament content of approximately 50 volume percent. The tensile strengths at 1400 and 1800 F were also low. These low strengths were attributed to the low aspect ratio of the filaments due to breakup during fabrication. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 16, 1967
- Accession Number
- AD0649509
Entities
People
- Charles W. Kistler Jr.
- Dale E. Niesz
- James N. Fleck
Organizations
- Battelle Memorial Institute